N91 — ICD-10-CM Diagnosis Codes
- N91 Absent, scanty and rare menstruation
- N91.0 Primary amenorrhea billable
- N91.1 Secondary amenorrhea billable
- N91.2 Amenorrhea, unspecified billable
- N91.3 Primary oligomenorrhea billable
- N91.4 Secondary oligomenorrhea billable
- N91.5 Oligomenorrhea, unspecified billable